Add vibe-aware playlists with CLAP text embeddings

Blend taste profile with text-embedded mood descriptions (e.g. "chill
ambient lo-fi") using pre-blended vector search against the existing
HNSW index. New optional `vibe` and `alpha` params on playlist generate
and recommendations endpoints. Backward compatible — no vibe = pure
taste profile (alpha=1.0).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -41,6 +41,16 @@ curl http://192.168.86.51:8321/api/recommendations?limit=20
 curl -X POST http://192.168.86.51:8321/api/playlists/generate \
   -H "Content-Type: application/json" \
   -d '{"total_tracks":20,"known_pct":30,"speaker_entity":"media_player.living_room_speaker_2","auto_play":true}'
+
+# Generate a vibe-based playlist (mood/activity matching)
+curl -X POST http://192.168.86.51:8321/api/playlists/generate \
+  -H "Content-Type: application/json" \
+  -d '{"total_tracks":15,"vibe":"chill ambient lo-fi","speaker_entity":"media_player.living_room_speaker_2","auto_play":true}'
+
+# Vibe with custom blend (alpha: 0=pure vibe, 0.5=blend, 1=pure taste)
+curl -X POST http://192.168.86.51:8321/api/playlists/generate \
+  -H "Content-Type: application/json" \
+  -d '{"total_tracks":15,"vibe":"upbeat party music","alpha":0.3,"auto_play":true,"speaker_entity":"media_player.living_room_speaker_2"}'
 ```
 
 ## Environment Variables